The best lav mic you can get for the money is a
Giant Squid: [not an affiliate link]
$50, dude:
https://darren-nemeth.squarespace.com/
This guy used to make these by hand, but now he has a manufacturer making them so it won't take so long to ship out. Best way to get one in on Amazon, the first link. Good audio quality and the easiest microphone I have ever used--This is coming from a old musician. I get a more consistent sound with this microphone than any other microphone I have.
Syncing audio with video in post production slows me down too much! I abandoned the dark side a long time ago and chose the light side of the Force, lol:
https://beachtek.com/product/dxa-micro-pro/ This using will sync audio and video in camera but give you a much better audio signal just like on the cinema cameras.